The IL25 gene helps immune cells send signals that shape inflammation, especially in the lungs, skin, and gut. In medicine, this gene is important because it helps regulate the type of immune response linked to parasite defense and many allergies. If its activity is too low or too high, that balance can shift, which may affect how your body handles infections or increase the chance of allergic inflammation such as asthma. Variants in the IL25 gene are usually interpreted as influencing risk rather than confirming a diagnosis on their own.
What is a gene?
Genes are stretches of DNA that give your cells instructions for making molecules or regulating processes in the body. Some genes carry the directions for producing proteins, the working parts of cells. Others mostly help decide when certain processes happen, where they take place, and how strongly they run. Taken together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. For a more detailed look at this topic, you can learn more in the LearnHub.
Overview
IL25Gene function
What if the gene works
The IL25 gene helps make a signaling protein that supports immune responses at body surfaces such as the lungs, skin, and gut. It helps certain immune cells respond to parasites and tissue irritation.
Risk
What if the gene does not work
If the IL25 gene works less well, signaling that helps certain immune cells communicate can weaken or become unbalanced. Milder variants may slightly change this messaging, while more severe variants can reduce IL-25 production or signaling more strongly.
Treatment
What does that mean for your treatment
No IL25-specific treatment or management approach is currently established for people with a pathogenic variant in the IL25 gene. Research is exploring whether IL25-related signaling might serve as a biomarker or drug target in asthma, allergy, and other inflammatory conditions.
Gene function
What if the gene works
The IL25 gene helps your body send local immune signals at surfaces such as the airways, gut, and skin. Its protein helps nearby cells respond in a coordinated way. This is part of the everyday protection that keeps body linings ready for contact with food, microbes, and the environment.
The IL25 gene makes a signaling protein that cells release to communicate with nearby immune cells. This helps start a coordinated response in the tissue around them.
One of its main jobs is to promote type 2 immunity, which helps the body respond to parasites and protect delicate body linings. This is a central part of IL25 gene function in the immune system.
IL25 encourages immune cells to release other messenger proteins, including IL-4, IL-5, and IL-13. These signals help shape a response that fits barrier tissues such as the lungs and gut.
IL25 activity is especially important in tissues that face the outside world, including the airways, intestines, and skin. It helps these surfaces stay alert and communicate quickly when protection is needed.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. In some instances, though, a variant can affect how a gene works more substantially and may contribute to or directly cause a genetic condition.
Genetic variants
What if the gene does not work
How variants in the IL25 gene affect protein function depends on the change: some alter how much IL-25 is made, while others affect folding, secretion, receptor binding, or stability. Milder variants may slightly shift signaling strength, while more severe variants can create a shortened protein, leave it unstable, or sharply reduce activity at the cell surface.
How variants are linked to conditions
At this point, the IL25 gene does not yet have a broadly confirmed link to a specific health condition, although research on how IL25 gene variants are linked to conditions is still developing. If you have a reported variant in the IL25 gene, your doctor or genetic counselor can explain what that result means in the context of your own health and family history.
A variant is not necessarily a diagnosis
Gene variants are a usual part of human biology and are widely seen in the general population. Most have no direct impact on health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when several genes and environmental factors contribute. In some situations, though, a single well-characterized variant in a particular gene is enough to confirm the diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that clearly increase or reduce health risk related to the IL25 gene. If a test finds a change in IL25, its meaning usually depends on the exact change and your overall health and family history, so discussing personal risk with a doctor or genetic counselor can help.
Inheritance of IL25 variants
There is not yet a broadly confirmed Mendelian pattern for how IL25 variants are inherited in relation to a specific human condition, so the answer to how IL25 variants are inherited remains cautious and may change as research develops. The IL25 gene is located on chromosome 14, which is an autosome, so you inherit one copy from each parent. That means any change in the IL25 gene could be passed through either side of the family.
What does my IL25 result mean for my family?
There is not yet a broadly confirmed inherited pattern tied to a specific, well-established genetic condition for IL25. If you have a specific IL25 result, what it means for relatives depends on the exact change found and the health issue being evaluated, and a genetics specialist can explain that in the context of your family.
Genetic information
Genetic testing
How you find out about variants
Variants in the IL25 gene are found with genetic testing, often called IL25 gene testing for variants, using DNA from blood, saliva, or a cheek swab. The lab reads the gene’s sequence and compares it with a reference sequence to identify changes and classify whether a variant is likely benign, uncertain, or clinically important.
When should I consider getting a genetic test?
There isn't yet a broadly established, IL25-specific clinical reason for testing. Decisions are usually based on your symptoms, health history, and family history with a doctor or genetic counselor.
A genetic result is only one part of your health story
Genetic results can provide useful insight, but how much they explain depends on the condition and the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, also shape how the body works. In some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is best considered alongside other parts of care. In other situations, a genetic result can give a clear answer. In areas like medication response, these results can also help put individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in DNA can change how the body breaks down a drug, moves it through the body, or reacts to it at its target. This helps explain why the same treatment may work well for one person, work less well for another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can affect the way people respond to medications. It studies links between genes and drugs to understand why the same treatment may work differently from one person to another. For many medicines, genes can influence both how the body processes a drug and how strong its effects are. This information can support more well informed and individualized treatment decisions. More about this topic is available in the LearnHub.
Drugs influenced by the IL25 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choices, so general concerns about symptoms, treatments, side effects, or medicine changes are best discussed with your doctor or pharmacist.
History
The IL25 gene entered the scientific literature in the early 2000s, when researchers were expanding the map of immune signaling genes and first described its product as IL-17E. This naming reflected its place within the broader IL-17 family at the time. From these first observations, research expanded steadily. As more studies compared related signaling molecules and their receptors, IL-17E became widely recognized as IL-25, the name now commonly used in medical and research writing. Over time, this shift in naming helped bring more consistency to the field. The history of the IL25 gene is mainly a story of modern immune research, with its place becoming clearer as genetic and protein studies advanced.